Small Ruminant Dairy Newsletter Winter/Spring 2008

Small Ruminant Dairy
Newsletter
CEN T ER F O R SU STAI NA BL E AG RI CU LTU RE
Winter/Spring 2008
Carol Delaney, Small Ruminant Dairy Specialist,
UVM, 200B Terrill Hall, Burlington, VT 05405
802-656-0915, [email protected],
www.uvm.edu/sustainableagriculture/smallrumi.html
DONATION BUYS MILK METERS
The Small Ruminant Dairy Project and VT Dairy
Herd Improvement Association are pleased to
announce the purchase of 5 more Surge Tru-Test
small ruminant milk meters. This will enable VT
DHIA to handle more milk testing of goat and sheep
dairies in Vermont. This purchase was made
possible by personal donations made to the Small
Ruminant Dairy Project in 2007 by Spencer Wright
and Andrée Falardeau who live in Waitsfield, VT.
Mr. Wright and Mme. Faldareau are owner/
operators of CANUS Goat‟s Milk ©, a maker of
popular skin care products. Find out more at
www.canusgoatsmilk.com. We send our great
appreciation to these donors for supporting the
small ruminant dairy industry in Vermont!
“It shall be the object and duty of the
State agricultural experiment
stations…to conduct..researches,
investigations, and experiments bearing
directly on and contributing to the
establishment and maintenance of a
permanent and effective agricultural
industry..including..such investigations
as have for their purpose the
development and improvement of the
rural home and rural life…”
ARE TOO MANY SPRING KIDS GETTING YOU
DOWN? ARE OTHER MANAGEMENT
STRATEGIES AN OPTION?
EXTENDED LACTATIONS TO AVOID KIDDING.
-1887 Hatch Act passed by US Congress
A current question raised by dairy goat
businesses is, “What do I do with the male kids and
extra doe kids?” One solution might be to breed
dairy goats once every two years rather than every
year. However, little research has been done to
test the viability of this option. As summarized in
the last issue of the Small Ruminant Dairy
Newsletter in December 2007,
www.uvm.edu/sustainableagriculture.smallrumi.htm,
a farm in Spain compared the production of goats
bred once a year and given a dry period with goats
that were bred only once in two years and milked
continuously. We presented the conclusion of that
study and that was that extending lactation reduced
overall milk yield over the 2 year period by 8.2 %
including a 32% reduction during the 2nd lactation
when goats were not rebred. However, this
reduction might be a worthwhile option when
farmers are looking to reduce metabolic stressors
TABLE OF CONTENTS
Donation Buys Milk Meters ............................... 1
Too Many Spring Kids Getting You Down? ...... 1
Antibiotic Treatment Residues .......................... 3
Good Thing About Spring Kids .......................... 4
Consider Barley on Pasture .............................. 4
1
on the goats during kidding and/or simplify herd
management (Salama, Caja, Such, Casals,
Albanell, 2005). While the research is valuable,
there are two significant problems with applying it to
the circumstances at New England goat dairies.
First, it has not been replicated (measured and
reported) and, second, there are many variables
that differ between New England goat dairies and
Spanish goat dairies.
them bred. I asked her how she selects does to
keep and she could only offer that she has her
„favorites‟. The replacement doelings she keeps
are raised and not bred until they are about 18
months. This group of kids born in the fall and
other goats that have gotten into the schedule
seem to follow that pattern much more easily than a
new doe brought in who has always freshened in
the spring.
Rivendell Meadows Farm in Albany, VT
employed this method at one point when they had a
commercial dairy/cheesemaking business. They
did not like selling kids to slaughter and had
exhausted their pet market. Oak Knoll dairy applies
this practice only when certain does maintain good
milk production (4 lbs per day) naturally when
unbred. Does‟ Leap Farm in Bakersfield is
experimenting by milk through a small group of
yearlings that kidded last spring.
Lori easily finds homes for the fall kids and
can sell or decide to keep any does that don‟t
breed. She sells her milk to cheesemaker Joanne
James in Alburg. Joanne can sometimes take does
that don‟t breed. As an aside, both herds have
instituted a CAEV prevention program (Caprine
Arthritis Encephalitis Virus) and Joanne has space
to maintain the kids and growing replacement
doelings. Lori is pleased with the milk production of
the herd but the average lactation yield is still being
calculated.
Fall Kidding at BlueTop Farm
Fall Kidding Using Light Treatment
Another choice is to try to switch part or all
of your herd to freshen in the fall to redistribute kid
sales to another time of year when there are other
holidays demanding kid meat and fewer farms
supplying kids. One example of a goat dairy in
Vermont that has operated that way is that of Lori
Choiniere of Highgate. She only milks after her 3550 goat herd freshens in September, so that the
goats have a 5 month dry period from April –
August. Lori and her husband, Luc, also operate
an organic cow dairy and they do like to enjoy
some summer vacation time on Lake Carmi so
having the goats dry during the summer is
desirable.
Another large herd in Pennsylvania did the
switch years ago. This was done by using barn
lights that can extend the “daytime” to give
December the same number of daylight hours as
June. What effect does changing daylight hours
have on dairy goats? As related in “A Different
Kind of „Seasonal‟ Breeding” (2002 Dairy Goat
Journal), Danny Harter and Anne Whitney of
Pennsylvania decided to find out in 2001. They
chose to breed their entire herd, starting with about
208 does, in the spring of 2001 and had 190 to
freshen in September and October. That winter,
they produced about 1,000 pounds of milk per day.
Apart from the hand-breeding that they did in the
spring, their success was attributed to the artificial
light they used to reverse the daylight hours as
experienced by their goats. They set their lights to
20 hours per day at the end of December and
turned the lights off by March 1. The system
worked well enough that within a month after the
lighting was reduced at the end of February, the
does started coming into heat. Harter and Whitney
have continued to breed in the spring and freshen
in the fall because their success has allowed them
to take two weeks of vacation in the middle of the
summer.
She has been breeding her small herd of
goats out of season for 3 years or more and has
not employed any special light treatment but kept
the bucks separate for 6 months before introducing
them. She admits that the does are in good
condition and is feeding them about 1 lb. of grain
per day during the mating period. The buck effect
is large and she employs 1-2 bucks as she has a
dry goat/doeling group and usually a group in the
milking barn where some does are still milking too
well to dry off in April. She puts the bucks in 5
months before she wants them to start kidding and
keeps them together for 2 months. Lori has
accepted a 50-70% conception rate in the past.
We calculated this past season‟s conception rate at
76% and she feels it gets easier each year to get
They used buck numbers of 3 bucks per 36
doelings and 2 bucks per 25 young does. Milking
does were handbred when they came into heat.
Ultrasounds done in June revealed any unbred (5)
2
does. Adult does kidded from mid-September and
finished the first week of October. Seventy-five
yearlings were busy kidding the first 2 weeks of
September. Over the out-of-season breeding
period, through the kidding and early lactation time,
they culled 20% of the does for a multitude of
reasons. They were satisfied with their milk
production as it averaged 8 lbs per doe per day in
October. In January, their 167 milkers gave just
under 1,100 lbs a day (6.5 lbs/doe/day).
animals. They describe the antibiotic molecule has
having a tendency to bind to calcium and then get
precipitated out in the curd. The concentration of
the drug is actually twice as high in the cheese as it
is in the milk because of this.
Kidney and muscle samples taken from kids
fed this milk for a short time showed no drug
residue after 35 days but it was present in the liver.
Ampicillin is a broad spectrum antibiotic
used for pathologic conditions (intramuscular for
respiratory, intestinal) and prophylactically (topical)
to prevent mastitis against Gram + and –
pathogens. The same Italian researchers treated
lactating Alpine does by intramuscular injection of
Ampicillin (long-acting formula using clavulanic acid
and Sublactam; no dose level given). Similar
sampling was done in milk, cheese and tissue from
kids fed the milk.
If using extended lactation as a
management tool is more appealing, other factors
that influence the outcome of extended lactation
include seasons of breeding and parturition, length
of nursing, nutrition, duration of lactation,
reproductive performance, and method of breeding.
Look for more articles in future issues here.
A Different Kind of “Seasonal” Breeding. (2002). Dairy
Goat Journal. May/June, p. 32-34.
They found Ampicillin residues in the milk,
cheese and whey for up to 108 hours after the
treatment. Most of the drug was found in the whey
(up to 80%) vs the cheese. There was no residue
in the liver, kidney and muscle samples taken from
kids fed the milk 35-40 days before.
Salama, A.A.K., Caja, G., Such, X., Casals, R., Albanell,
E. 2005. Effect of Pregnancy and Extended
Lactation in Dairy Goats Milked Once Daily. J.
Dairy Sci. 88:3894-3904
-Written by Dianne Johnson and Carol Delaney
These experiments have confirmed that
intramuscular use of long-lasting oxytetracycline
requires 180 hours (7.5 days) of withholding for the
milk and up to 35-40 days for meat in kids fed the
milk. There still may be residues in organ meat.
Ampicillin is clear from milk, cheese and whey after
108 hours (4.5 days) and not found in kids at 25-40
days after they have drunk contaminated milk.
ANTIBIOTIC TREATMENT RESIDUES
If you choose to use antibiotics in your
goats or sheep to treat illnesses, what is the
resident time the drug stays in the milk, cheese,
meat or organs in kids or lambs fed this milk?
There are withdrawal/withholding times
recommended for these drugs based on research
with cattle.
For possible alternatives to antibiotics for
prevention and treatment of diseases in goats or
sheep, contact the VT Organic Farmers (at the
office of Northeast Organic Farming Association of
Vermont) at 802-434-3821. They can recommend
books, practitioners and farmers to talk to on how
they live without antibiotics on their farms. For me,
one strong message is that feeding treated milk to
kids continually will put residues in the meat and
organs, so it would be advisable to avoid that
practice.
For example, some veterinarians could
prescribe Oxytetracycline as a therapy for mastitis
or lameness and treat the animal with an
intramuscular injection with a single dose. In Italy,
they researched the disappearance of the drug
after treatment in Saanen milk goats. The
experiment treatment was on 8 Saanen lactating
does given a single dose of long-acting
Oxytetracycline (20mg/Kg). They took milk
samples from the does and fed kids with the treated
milk and then slaughtered the kids at 35-40 days
after drinking milk from treated goats.
Faciolo, A., Coresi S., Cozzani R., Anastasi G., Longo
F., Cinquina A.L. 2000. Use of Ampicillin in the goat
farm: pharmoacokinetic distribution in milk and its
derivatives. Pharmacokinetic study of oxytetracycline in
th
experimentally treated goats. Proceedings of the 7
International Conference on Goats, 2000, pp 613-614.
They found drug residues in the milk and
cheese until 180 hours after administration. The
whey from the cheese made from this milk showed
no residue after 156 hours of treatment of the
3
THE GOOD THING ABOUT SPRING KIDS IS…
a high protein meal and vice versa. He says that
on a daily basis, animals need 5 times more energy
than protein in their diet. And they can store
excess energy as fat. The palatability is highly
influenced by the energy content of the diet.
…it sets up your farm to take advantage of the low
cost of grazing/browsing when the doe is at her
highest feed intake. And, milk produced on fresh
herbage means higher Vitamin A and E (as ά
tocopherol). Vitamin E is an anti-oxidant that
protects lipids and cholesterol from being oxidized.
This prevention of lipid and cholesterol oxidation
has a health benefit as it is being discovered that it
is the oxidized products that contribute to
atherosclerotic plaque formation causing heart and
circulatory disease rather than the cholesterol and
lipids themselves. Research by L. Pissoferrato, et
al. in Italy showed that goats fed on pasture
produced significantly higher levels of Vitamin E in
their milk and in the cheese than in goats fed hay.
Feeding grain above 600 grams (1.3 lbs.) per day
negated the benefits of grazing and the levels of ά
tocopherol were reduced to levels in the milk that
were found with no pasture or indoor feeding.
One way to efficiently use the energy fed is
to match the rates of digestion of the protein to the
energy source. As we said, on grass/browse, the
protein is rapidly broken down by rumen microbes.
The microbes are happiest and give the most
satisfying by-products to the animal (VFA‟s,
microbial protein) when they have the ready energy
for the protein. Some proteins fed can be digested
more slowly and this usually comes from protein in
the concentrate from roasted soy or distillers
grains. It is good to increase the portion of slower
digested protein in the grain ration during the
summer months.
Pizzoferrato L., Manzi P., Rubino R., Fedele V.,
Pizzillo M. Degree of antioxidant protection
in goat milk and cheese: the effect of
feeding systems. Proceedings of the 7th
International Conference on Goats, 2000,
pp 580-582.
To best match soluble pasture protein,
specialists speaking at the 2008 NOFA winter
conference recommended feeding a concentrate of
up to 25% barley grains to cows on early pasture.
Barley is a rapidly digestible energy source due not
only to its amount of starch but its high amount of
rapidly digesting starch. (see below). Oats and
wheat mids are also useful in grazing diets.
CONSIDER BARLEY/OATS/WHEAT IN YOUR
SUMMER PASTURE RATION
Table 2. Starch content and degradation of grains
(Herrera-Saldana et al., 1990).
For ruminants on pasture and browse, the animal is
continually seeking to balance the energy and
protein in the diet to match its needs (among other
nutrients). This is one way Dr. Fred Provenza from
Utah State University explains the animal behavior
of what livestock choose to ingest when they are
eating fresh feed outside. In a high producing ewe
or doe, she is going to seek higher protein and
energy levels in her diet. On fresh forage, the
protein is in a form that is rapidly digested by the
microbes because much of the protein is in a more
soluble form. To capture the protein, the microbes
need a quick matching supply of energy or else
protein is not only wasted, it robs energy from the
ewe/doe to get rid of the excess protein as urea.
Feed
Corn
Barley
Oats
Wheat
Milo
Starch Content
Starch Degradation
% DM Range
Rate1, %/hr
76
64
58
70
71
72-78
60-74
52-69
67-77
68-78
6
9
15
24
3
Rapidly
Degraded2, %
21
66
97
78
4
1 Determined in vitro.
2 Fraction that was rapidly degraded, determined in situ.
The Small Ruminant Dairy Project is supported at UVM by the Center
for Sustainable Agriculture, the UVM Animal Science Department and
UVM Extension. University of Vermont Extension, and U.S.
Department of Agriculture, cooperating, offers education and
employment to everyone without regard to race, color, national origin,
gender, religion, age, disability, political beliefs, sexual orientation, and
marital or familial status. UVM Extension proudly supports the Center
as a forward-looking model for community-university partnershi
According to Provenza‟s research, high
energy feed is more palatable (animals choose to
eat it and eat it at a higher rate) when offered after
4
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